The marriage of crusty bread and chocolate was consummated many years ago in Europe, but this tricked-out sandwich goes a step further. We took the best of a pain au chocolat and a churro, tossed it on the grill, and cut it into thin slices—the perfect accompaniment for your next sundae.

4Grill 5 minutes, pressing frequently with a metal spatula, until grill marks have formed on the bottom and the crust is browned. Flip and sprinkle 1/2 of the cinnamon sugar on the grilled side. Grill the other side until browned and crusty, about 5 to 8 minutes more.